# bouncing_balls.py import pygame balls = [] for i in range(3): balls.append(Ball()) size = 15 speed = 3 while True: for b in balls: b.draw()
Learn by
touching,
not just reading.
CH₄ · Methane
Sum: 180°
10kg
Mass10 kg
Force98 N
Height0.0 m
The 5-format approach
Same concept. Five ways to make it stick.
Use the format that matches your mood: play first, read the story, test yourself, copy the patterns, then review with flashcards.
📌 Showing: Python For Loops
🎮 Interactive START HERE
Edit the yellow numbers. Watch the canvas react. Touch first, read after.
# Try editing the yellow numbers import pygame balls = [] for i in range(5): balls.append(Ball()) size = 18 speed = 4 while True: for b in balls: b.draw()
📖 Story
Now that you have played with it, here is why it works in 60 seconds.
Maya had a problem. Her novel had 400 pages, and she needed to print"Page X" at the top of each one. She started typing print("Page 1"), then print("Page 2")... and gave up at page 5.
Her friend Jin watched, smiled, and typed this:
for i in range(400): print("Page", i + 1)
Three lines. 400 pages. The for loop did what would have taken Maya an hour — in less than a second.
That is all a for-loop is: a way to tell Python "do this thing, once for each item in this list." The range(400) part generates the numbers 0 through 399 to loop over.
❓ Quiz
Three quick questions with instant feedback.
Question 1 of 3
Score: 0
🎉 Quiz complete!
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📋 Cheatsheet
Every for-loop pattern you need, on one page.
python · for loops
for i in range(5):Repeat 5 times: i = 0, 1, 2, 3, 4
for i in range(1, 6):Loop from 1 to 5 using start and stop
for i in range(0, 10, 2):Even numbers 0–8 using start, stop, step
for item in my_list:Loop over every item in a list
for i, item in enumerate(my_list):Loop with both index and value
for key, val in my_dict.items():Loop over dictionary key + value
for x in reversed(my_list):Loop in reverse order
[x*2 for x in range(5)]List comprehension: a compact for-loop
🃏 Flashcards
Click to flip. Rate yourself. Review until the idea is automatic.
What does
range(5) produce?
Tap to flip
The numbers 0, 1, 2, 3, 4 — five values, starting at zero.
How well did you know it?
Card 1 of 5
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